JPH1041190A - Capacitor element assembly - Google Patents

Abstract

(57) [Problem] To provide a capacitor element assembly having a configuration capable of further improving safety at the time of short-circuit breakdown between electrodes of a capacitor element and reducing manufacturing cost. SOLUTION: A plurality of capacitor elements 1 are stacked so that electrode portions of the capacitor elements 1 are electrically the same polarity,
The supporting element 6 and the electrode lead 7 are integrally formed in the assembled capacitor element assembly. The electrode lead 7 has a spring property and has an inclined portion 7a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor element assembly formed by assembling a plurality of capacitor elements for electric power and electric equipment.

[0002]

2. Description of the Related Art Conventionally, a capacitor element assembly having a structure in which a plurality of capacitor elements are stacked so that the element electrode portions of the capacitor elements have the same polarity has been proposed.
No. 629 discloses a conventional example. This will be described below with reference to FIGS.

As shown in FIG. 11, in a conventional capacitor element 1, one of lead pieces 3 is connected to a frame-shaped connection fitting 2,
The other of the lead pieces 3 was connected to the element electrode section 4 of the capacitor element 1 as a connection section 5 by soldering or welding. 12, the element electrode portion 4 of the capacitor element 1 is soldered or welded directly to the frame-shaped connection fitting 2 without using the lead pieces 3 shown in FIG.

In recent years, with the increase in capacity of electrical equipment and the like,
Due to problems such as the equipment area, the capacitors used for them have been increasing in energy density. Therefore, if the capacitor is destroyed, a large amount of destructive energy will be generated, and securing safety has become an even more important issue. Further, simplifying the process of manufacturing a capacitor as much as possible leads to a reduction in the cost of manufacturing equipment and man-hours.

[0005]

However, in the conventional capacitor element assembly shown in FIG. 11 as described above, since the two components of the frame-shaped connection fitting 2 and the lead piece 3 are used, they are connected. And the more the number of capacitor elements 1 increases, the more complicated the operation becomes. Further, as shown in FIG. 12, in the case where the element electrode portion 4 is directly connected to the frame-shaped connection fitting 2 without using the lead pieces, the capacitor element may be broken in a form of being short-circuited between the electrodes. In this case, when the connection portion 5 of the frame-shaped connection fitting 2 of the short-circuit-damaged capacitor element is peeled off, the connection portion 5 of the frame-shaped connection fitting 2 of the adjacent capacitor element other than the destructive capacitor element is also removed. In some cases, it was peeled off. In other words, in a capacitor having a high energy density, when a short circuit occurs between the electrodes, a large amount of destructive energy is generated in a direction in which the connection portion 5 of the frame-shaped connection fitting 2 is separated from the element electrode portion 4. Therefore, when a stress is applied in a direction in which the connection portion 5 of the frame-shaped connection fitting 2 is peeled off, the frame-shaped connection fitting 2 itself does not have a configuration capable of absorbing and relaxing the force. The connecting portion 5 of the metal fitting 2 is also peeled off at the same time. As a result, the charge stored in the capacitor after the breakdown may not be sufficiently discharged.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and can simplify the assembly of a capacitor element assembly. If the capacitor element is broken between electrodes, a plurality of capacitor elements close to the broken capacitor element are provided. To provide a capacitor element assembly using a connection metal piece that prevents the connection portion between the connection metal piece and the element electrode portion from peeling over, thereby providing a capacitor element assembly with higher safety and lower manufacturing cost. It is an object.

[0007]

In order to achieve the above object, a capacitor element assembly according to the present invention comprises a plurality of electrode lead portions of a connection fitting in which a support portion and a plurality of electrode lead portions are integrated. Are individually connected to the element electrode portions of the respective capacitor elements.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention uses a connecting member in which a support portion and a plurality of electrode lead portions are integrated with each other. It can be easily implemented by connecting to the element electrode portions of the capacitor elements that are individually stacked and assembled. In addition, since the connection fitting has the support portion and the plurality of electrode lead portions integrated with each other, the connection work with the capacitor element is easy.

Further, as described in claim 2, the connection between the electrode lead and the element electrode is unlikely to be disconnected by using a connection fitting having a spring property for the electrode lead. In the event of destruction in the form of a short circuit,
An object of the present invention is to prevent the connection between the element electrode portion and the distal end connection portion of the electrode lead portion of the connection fitting over a plurality of capacitor elements adjacent to the broken capacitor element.

The above-described action of preventing the connection portion from being peeled off can be exerted by bending the electrode lead to form an elastically processed portion so that the electrode lead has elasticity. Things.

Further, the thickness of the electrode lead portion is made thinner than that of the support portion as described in claim 4, or the thickness of the electrode lead portion is gradually reduced as the thickness of the electrode lead portion becomes closer to the distal end connection portion. By doing so, the heat capacity of the electrode lead portion can be reduced, and the amount of heat required for soldering or welding the tip connection portion of the electrode lead portion to the element electrode portion can be reduced, and therefore the time required for connection can be reduced. .

Further, by using a connection fitting having a plurality of electrode leads for one capacitor element, the instantaneous breakdown current can be divided and the peel strength can be improved. it can.

According to the present invention, the electrode leads are provided symmetrically with respect to the support, so that the distal end connecting portion at the distal end of the electrode lead is less likely to be peeled off from the element electrode. be able to.

[0014]

Embodiments of the present invention will be described below. The same components as those in the conventional example shown in FIGS. 11 and 12 are denoted by the same reference numerals, and detailed description is omitted.

(Embodiment 1) In FIG. 1, a plurality of element electrode portions 4 of each capacitor element 1 are stacked with the same polarity in the same direction, and a vertically extending support portion 6 is provided. Are firmly held as an aggregate by a connection fitting 8 in which a plurality of electrode lead portions 7 provided integrally are provided.

The connection between the connection fitting 8 and the capacitor element 1 is performed by soldering or welding the tip connection part 9 at the tip of the electrode lead part 7 to the element electrode part 4.

Therefore, unlike the conventional example shown in FIG.
Since the electrode lead portion 7 integrated with the support portion 6 is simply connected to the element electrode portion 4 of the capacitor element 1, assembly and connection are easy, and the manufacturing cost of the capacitor element assembly is low.

(Embodiment 2) As shown in FIGS. 2 and 3, in Embodiment 2 of the present invention, the electrode lead portion 7 has a spring property. FIG. 3 is an enlarged bottom view as viewed from the direction of arrow A in FIG. 2. The support portion 6 is separated from the capacitor element 1 and the capacitor element 1 is held in the connection fitting 8 only by the force of soldering or welding of the distal end connection section 9. Have been. The electrode lead portion 7 has an inclined portion 7a as an elastic processing portion.

In order to give the electrode lead portion 7 a spring property, a bent portion 7b may be provided as shown in FIG. 4A, for example, in addition to the configuration shown in FIG. As shown in FIG. 4B, which shows an enlarged side view as viewed from the direction of arrow B, a folded portion 7c is provided on the electrode lead portion 7, a corrugated portion 7d is provided on the electrode lead portion 7 as shown in FIG. An arc portion 7e may be provided on the electrode lead portion 7 as shown in FIG. That is, the bent portion 7b, the folded portion 7c, the corrugated portion 7d, and the circular arc portion 7e function as elastic processing portions, and have a function of giving the electrode lead portions 7 a spring property.

Although not shown in FIG.
A conductive material having an elastic action may be used as the material for the above.

With the above configuration, the peel strength of the electrode lead portion 7 to the device electrode portion 4 is increased, and furthermore, if the capacitor element 1 is broken down in a form of short-circuit between the electrodes, the electrode lead portion 7 is removed. The stress due to the breaking energy generated in the direction of peeling from the element electrode portion 4 is absorbed and relaxed. Therefore, the stress due to the destruction transmitted to the support part 6 at the time of destruction is also alleviated, and the exfoliation of the tip connection part 9 of the electrode lead part 7 and the element electrode part 4 over a plurality of capacitor elements adjacent to the destructed capacitor element is prevented. be able to.

FIG. 5 shows the effect of the present invention.
A test comparing the peel strength between the element electrode part, the connection part, and the tip connection part in each capacitor element assembly in the conventional example shown in FIG. 12, the example 1 shown in FIG. 1, and the example 2 shown in FIG. FIG. 6 shows the results, and FIG. 6 shows the samples used in the test. In all samples, soldering was performed to connect the device electrode portion 4 to the connection portion 5 or the tip connection portion 9, and the tensile direction was perpendicular to the surface of the device electrode portion 4 as shown by an arrow in FIG. Direction.

As can be seen from FIG. 5, the peel strength was measured in Example 2.
Is the strongest, then the capacitor element aggregate of the first embodiment, and the weakest is the capacitor element aggregate of the conventional example.

Furthermore, the condition of peeling of the capacitor element adjacent to the tested capacitor element was as follows. In the conventional capacitor element assembly, the connection portion 5 was peeled over the upper and lower two capacitor elements. In the capacitor element assembly, no peeling was observed on all of the capacitor elements,
In particular, Example 2 of the present invention was found to be excellent.

Therefore, by the structure of the capacitor element assembly of the second embodiment, the charge that has been charged in the capacitor after being broken is not discharged, and the safety of the capacitor can be further improved. .

(Embodiment 3) FIG. 7 is an enlarged bottom view of a capacitor element according to Embodiment 3 of the present invention.

As shown in FIG. 7, for the capacitor element of the third embodiment, a connection fitting 8 having a thin electrode lead portion 7f thinner than the supporting portion 6 of the connection fitting 8 of the capacitor element assembly shown in FIG. 1 is used. It is a configuration. Example 3
The capacitor element may be a tapered electrode lead portion 7g whose thickness is gradually reduced as shown in FIG.

With the above configuration, the heat capacity of the electrode lead portion is suppressed, and the amount of heat required for soldering or welding when connecting the electrode lead portion to the capacitor element electrode portion 4 at the distal end connection portion 9 is reduced. Therefore, the time required for connection can be reduced, so that the manufacturing cost of the capacitor can be reduced. At the same time, since damage to the film end surface of the capacitor due to heat can be reduced, deterioration of the capacitor characteristics can be suppressed and reduced. Further, since the support portion 6 can have an arbitrary thickness, the effect that the rigidity required for the support portion 6 can be freely secured can be obtained.

(Embodiment 4) FIG. 9 is a perspective view of a capacitor element assembly according to Embodiment 4 of the present invention.

As shown in FIG. 9, the capacitor element assembly according to the fourth embodiment has a configuration in which the electrode lead portion 7 uses a plurality of connection fittings 8 for one capacitor element 1.

With the above configuration, the current flowing through one electrode lead portion 7 is reduced, so that the heat generated by the current flowing at the connection point between the device electrode portion 4 and the distal end connection portion 9 is generated by the capacitor element. One electrode lead 7 for one
Since the size is smaller than the case where the number is made, the strength with respect to current is improved. Therefore, it is possible to cope with the design of a capacitor having a high energy density, and even if the capacitor element is short-circuited between the electrodes, a large destructive current flowing instantaneously can be divided by the plurality of electrode leads 7. The peel strength at the distal end connecting portion 9 between the portion 7 and the element electrode portion 4 can be improved,
The safety of the capacitor can be further improved.

(Embodiment 5) FIG. 10 is a perspective view of a capacitor element assembly according to Embodiment 5 of the present invention.

As shown in FIG. 10, in the capacitor element assembly according to the fifth embodiment, the position of the electrode lead portion 7 of the connection fitting 8 of the capacitor element assembly is line-symmetric or point-symmetric with respect to the support portion 6. This is a configuration in which a certain connection fitting 8 is used.

With the above configuration, the element electrode portion 4
Thus, the distribution of the current flowing from the electrode lead portion 7 is improved.
In particular, the amount of heat generated at the distal end connection portion 9 due to a large instantaneous breakdown current flowing when the capacitor element is short-circuited between the electrodes is not concentrated on a specific portion of the element electrode portion 4. Therefore, the electrode lead portion 7
The peel strength of the distal end connecting portion 9 between the capacitor and the element electrode portion 4 can be improved, and the safety of the capacitor can be further improved.

[0035]

As is clear from the above description, according to the present invention, it is possible to provide a capacitor element assembly having a configuration in which the safety of the capacitor can be improved more than before and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a capacitor element assembly according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a capacitor element assembly according to a second embodiment of the present invention.

FIG. 3 is an enlarged side view of an inclined portion of the electrode lead portion.

FIG. 4 (a) is a side view of a main portion of a bent portion which is an embodiment as an elastically processed portion according to a second embodiment of the present invention. (B) A front view of a main portion of the folded portion. Main part front view (d) Main part front view of the arc

FIG. 5 is a diagram showing a result of a tensile test of a connection portion in a capacitor element assembly of Example 1, Example 2, and a conventional example of the present invention.

FIG. 6 is a perspective view showing a sample capacitor element assembly for performing a tensile test of an electrode connecting portion shown in FIG. 5;

FIG. 7 is an enlarged side view of a thin electrode lead portion according to a third embodiment of the present invention.

FIG. 8 is an enlarged side view of the tapered electrode lead portion.

FIG. 9 is a perspective view of a capacitor element assembly according to a fourth embodiment of the present invention.

FIG. 10 is a perspective view of a capacitor element assembly according to a fifth embodiment of the present invention.

FIG. 11 is a perspective view of a conventional capacitor element assembly.

FIG. 12 is a perspective view of another conventional capacitor element assembly.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 capacitor element 2 frame-shaped connection fitting 3 lead piece 4 element electrode part 5 connection part 6 support part 7 electrode lead part 7a inclined part 7b bent part 7c bent part 7d wavy part 7e arc part 7f thin electrode lead part 7g tapered electrode lead Part 8 Connection fitting 9 Tip connection part

Claims (7)

[Claims] An element electrode portion of a capacitor element of a type having a metal-deposited film or metal-deposited paper in which metal is deposited on one or both sides of a plastic film or paper,
In a capacitor element assembly in which a plurality of capacitor elements are stacked and assembled so as to be electrically the same in polarity, a tip of the plurality of electrode leads of a connection fitting in which a support portion and a plurality of electrode leads are integrated A capacitor element assembly in which connection portions are individually connected to element electrode portions of the capacitor element. 2. The capacitor element assembly according to claim 1, wherein a connection fitting having a resilient electrode lead is used. 3. The capacitor element assembly according to claim 2, wherein the resilient electrode lead has elasticity by bending, thereby providing elasticity. 4. The capacitor element assembly according to claim 1, wherein a connection fitting is used in which the thickness of the electrode lead portion is smaller than that of the support portion. 5. The electrode lead according to claim 1, wherein the thickness of the electrode lead portion of the connection fitting is gradually reduced from a portion in contact with the support portion toward the tip connection portion. Capacitor element assembly. 6. The capacitor element assembly according to claim 1, wherein a connection fitting having a plurality of electrode leads for one capacitor element is used. 7. The capacitor element assembly according to claim 1, wherein a connection metal fitting whose electrode lead portion is at a position symmetrical with respect to the support portion with respect to a line or a point is used.